In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.
You skinned your elbow. 
I'll go get the first-aid kit...
Dein Knie ist aufgeschürft.
Ich hol den Verbandskasten, ja?
Tienes el codo raspado.
Tienes el codo raspado.
Tu t’es écorché le coude.
Je vais chercher du désinfectant.
Колено разодрал.